EE CLIMBED UP THE LADDER ON A BELT-HEAD ROCK-BOX TO CHECK THE OPERATION OF THE HANGING GOB SWITCH. WHEN HE ATTEMPTED TO CLIMB BACK DOWN AFTER CHECKING THE SWITCH HIS FOOT SLIPPED OFF THE STEP. HE CAUGHT HIMSELF ON THE EDGE OF THE BOX. HE WAS HELD FOR A MOMENT BY HIS RING WHICH CAUSED THE INJURY.